radeonsi: Lower TGSI_OPCODE_LOAD down to LLVM op (v3)
radeonsi: Lower TGSI_OPCODE_LOAD down to LLVM op (v3)

v2: new signature style for buffer intrinsics (offsets)
v3: new signature style for llvm.amdgcn.buffer.load.format (overloaded return)

Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com> (v2)

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler